DA0-002 Data Governance Practice Question
A data analyst is creating a report to compare the performance of different sales regions. The report will be used by regional managers to identify areas needing improvement. Which of the following visualization techniques would be most effective?
⚠ Common exam trap
Candidates often choose a pie chart (Option C) because they think 'contribution to the whole' is the goal, but the question asks for comparing performance across regions, which requires a common baseline — a task for which pie charts are notoriously poor.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A bar chart comparing each region's sales
A bar chart is most effective because it allows direct, side-by-side comparison of discrete categories (sales regions) using a common baseline, making it easy for regional managers to quickly identify which regions are underperforming. The vertical bars encode exact values with high perceptual accuracy, supporting the report's goal of highlighting areas needing improvement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A bar chart comparing each region's sales
Why this is correct
Bar charts enable easy comparison of values across categories.
- ✗
A line chart showing overall company sales
Why it's wrong here
Line charts show trends over time, not regional comparisons.
- ✗
A pie chart showing each region's contribution
Why it's wrong here
Pie charts show relative proportions but are less precise for comparing values.
- ✗
A scatter plot of sales vs. expenses
Why it's wrong here
Scatter plots show relationships between variables, not direct comparisons.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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